Exam Question

### (a) Automatic Backflushing Lubricating Oil Filter
#### Concept and Purpose
An automatic backflushing filter is a full-flow filtration unit installed in the main engine lubricating oil line. Its primary purpose is to continuously remove solid, insoluble contaminants (such as metallic wear particles, carbon deposits, and foreign debris) from the oil without interrupting engine operation. It acts as the final mechanical safeguard, or 'policeman', to protect sensitive components like bearings, journals, and piston cooling spaces from abrasive wear and blockage. The 'automatic backflushing' feature allows the filter to clean itself when it becomes clogged, ensuring a constant flow of clean oil to the engine.
#### Construction